Low-pressure steam and analogous heating system.



B. R. DOODY. LOW PRESSURE STEAM AND ANALOGOUS HEATING SYSTEM.

APPLICATION FILED JAN. 24, 1908.

Patented Feb. 2

wibwoozo PATENT oFmoE.

BARTHOLOMEW a. boom, oF GANTON,'MASSAOHUSETTS.

; LOW-PRESSURE STEAM AND ANALocous HEATING SYSTEM.

' Specification of Letters Patent.

' Patented Feb. 2, 1909.

Application filetlJanuai-y 24, 1908. Serial No. 412,395.

To all whom it may concern I ,Be it known that I, BARTHOLOMEW It.

DOODY, a citizen of the United States, reside ing at Canton, in the county of Norfolk and State of Massachusetts, have invented cer-" tain new and useful Improvements in Low- Pressure Steam and Analogous Heating Sys-. terms, of which the following is a specification. 7 My invention pertains to low pressure steam and analogousfheating systems; and

it has for one of its objects to provide an apparatus comprising means for automatically closing a furnace-door or damper when the pressure in the boiler of the system attains a predetermined point and'for opening the sai oor or damper when the pressure is reduced below the undue point, this with a view of assuring the maintenance of a uniform preslslure and the furnishing of auniform degree of eat. Another object of the invention-is the provision of simple and reliable means for indie eating to interested parties the amount of pressure present in the boiler of the system.

Another and very important object is the provision of means for'permitting the escape of steam and relieving the system from high pressure and the danger conseqeunt thereupon in the event of the furnace-door or damper failing for any reason to open when the working pressure in the system is raised to the predetermined high point.

The nature and the novelty, utility and practical advantages of theinvention will be fully understood from the following description and claims when the same, are read in connection with the drawings, accompanying and forming part of this specification, in which: 7

Figure 1 is a view partly in elevation and partly in vertical section, illustrating the apparatus constituting the best practical embodiment of my invention of which I am aware; Fig. 2, a detail elevation showing the adjustable connection of the furnace-door or damper cable-to the fioaty and Fig. .3, a detail section taken in the plane indicated by the line 3-3 of Fig. 1 and showing the parts in all of the views of the'drawings, refer- I ring .to which: V V

- A is .the expansiontank-of the apparatus damper and checks the fire.

connection between the lower ends of the duplex water gages and thewater-oontainer of r which is preferably in the form of an upright cylinder. The upper end of the said tank is open to the atmosphere, and with the lower end or portion thereof is connected a conduit B leading from the boiler (not shown) of the system. In: the expansion tank and movable up and down on the body of water therein contained is a suitable float C and to the said float is connected, preferably in the adilijistable manner best shown in Fig. 2, a cable in the form of a chain which is designed, in turn, to be connected with a furnace-door or dam or (also not shown). Thus it willbe manifest t at when the working pressure inthe systern reaches a predetermined high point, the pressure in the conduit B and the ex ansion of the heated water raises the water-in t e expansion tank and lifts the float and through the float and cable closes the furnace-door or n Then when the checkedfire results in a reduction of pressure in the boiler, the descending water and float in the expansion tank effect through the cable D a reopening of the furnace-door or damper, and consequently a uniform pressure is maintained in thesystem and the same is enabled to give off a uniform degree of heat.

With a view of enabling interested persons to note at a glance the amount of pressure present in the system, the duplex water gages E and F are provided. These gages are arranged outsideof the expansion tank A andtheirlower ends are connected through a valved connection G, Figs. 1 and 3, with the body of water contained in the tank. One of the said gages, namely the gage E, is open at its upper end to the atmosphere, while the other gage F'is connected, preferably through a valved pipe H with a pressure pipe I forming part of the systems. From this it follows that the gage F interposed between the tank A below the water line and the pressureopen at its upper end to the atmosphere will I 7 because of thepressure present in the system show a higher level of water, while the differencebetween the heights of the water in the two gages will indicate the amount of pressure in the boiler system.

The pressure pipe I extends down into a waterseal contained in a sub-tank J disposed at one side of the expansion tank A, and from the said pi e I, at about the proportional distance illustrated above the lower end thereof, leads a vent pipe K which extends upward and terminates in a goose-neck M. This provision is made for the sake of safety for it will be evident that in the event of the furnace-door or damper failing for any reason to work, and the pressure in the sys tem rising to a dangerous point, the excess pressure will force the water down pipe I to a point below where pipe K joins the pipe I, whereupon the steam will escape through the pipe K to the atmosphere until the pressure in the system is reduced to the normal. It will also be noted in this connection that any water that may be carried upward by the escaping steam will by the goose-neck M be returned to the sub-tank J, the upper end of which is preferably open. An overflow aperture N is provided for the sub-tank J, through which any excess of water will overflow into the expansion tank A.

The furnace-door or damper hereinbefore referred to may by adjustment of the float C on cable D be arranged to close at any desired or proper pressure in the discretion of the party installing the apparatus.

In addition to the practical advantages hereinbefore ascribed to my novel apparatus it will be noted that the apparatus is simple and inexpensive in construction and is calculated to withstand for an indefinite period the usage to which apparatus of corresponding character is ordinarily subjected.

As before stated the construction herein shown and described constitutes the best embodiment of my invention of which I am cognizant, but I would have it understood that I do not restrict myself to the particular construction and relative arrangement of parts shown as such changes may be made in the same as do not depart from the spirit of my invention or the scope thereof as defined in the claims appended.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1. The combination of a water-holding tank provided with a water-connection which communicates freely with the water chamb er of a boiler; a damper controlling float carried by the water in said tank; a pair of juxtaposed gages the lower end of each of which communicates freely with the lower part of said tank and the upper end of one of which is open to atmospheric pressure; and a steam pipe which leads live steam at boiler pressure into the upper end of the other of said gages, the difference in level of the water in said gages measuring the said boiler pressure.

2. The coml' ination of a water-holding tank provided with a water-connection which communicates freely with the water chamber of a boiler; a pair of juxtaposed gages the lower end of each of which communicates freely with the lower part of said tank and the upper end of one of which is open to atmospheric pressure; damper controlling means mounted in said tank, and controlled in position by the pressure in said tank; and a steam pipe which leads live steam at the boiler pressure into the upper end of the other of said gages, the difl'erence in level of the water in said gages measuring the sai d boiler pressure.

3. The combination of a water-holding tank provided with a water-conneelion which communicates freely with the waterchamber of a boiler; a damper-centrolling float carried by the water in said tank a water-seal tank; a steam-pipe which leads from the steam-chamber of the boiler and extends into the water in said water-seal tank; and a vent-pipe connected with said steam-pipe below the level of the water in said water-seal tank; said vent-pipe carrying away live steam and reducing the boiler pressure in case said damper-controlling float fails to maintain the boiler pressure below a certain predetermined limit or maximun'i.

4. In an apparatus for the purpose described, an expansion tank adapted to contain water and having an upper portion open to the atmosphere and a lower portion adapted to be connected with a boiler, a sub-tank arranged alongside the expansion tank and adapted to' hold a water seal, a pressure pipe extending down in the seal and open at its lower end, and a vent pipe lead ing upward from an intermediate point of the portion of the pressure pipe in the seal to a point above the seal where it communicates with the atmosphere.

5. In an apparatus for the purpose described, an expansion tank adapted to contain water and having an upper portion. open to the atmosphere and a lower portion adapted to be connected with a boiler, a sub-tank arranged alongside the exiansion. tank and adapted to hold a water seal, a pressure pipe extending down in the seal and open at its lower end, a vent pipe leading upward from an intermediate point of the portion of the pressure pipe in the seal to a point above the seal v. here it communicates with the atmosphere, and a float movable in the expansion tank and adapted to be connected with a furnace damper or the like.

6. In an apparatus for the purpose de scribed, an expansion tank adapted to contain water and having an upper portion open to the atmosphere and a lower portion adapted to be connected with a boiler, a subtank arranged alongside the expansion tank and adapted to hold a water seal, a pressure pipe extending down in the seal and open at its lower end, a vent pipe leading upward from an intermediate point of the portion of the pressure pipe in the seal to a point above the seal where it communicates with the atmosphere, a water gage connecting the lower portion of the expansion Ell) tank and the pressure ipe, and a second Water gage arranged a aoent to the first mentioned gage and connectedat its lower end to the expansion 'tankand having its upper portion open to the atmosphere.

7. In an apparatus for the pur'ose described, an expansion tank adapte to contain Water and having an u per portion:

open to the atmosphere'and a ower portion adaptedto be connected with a boiler, a

sub-tank arranged alongsidethe expansion tank and adapted to hold a Water seal, a pressure pipe extending down in the seal and open at its lower endfa vent pipe leading upward from an intermediate oint of the portion of the pressure pipe in t e seal to a signature in t point above the sealwhere it communicates with the atmosphere, a float movable in the expansion tank and adapted to be connected with a furnace dam er or the like, a water 2 gage connecting the ower portion of the expansion tank and the pressure pipe, and a second water gage arranged adjacent to the first mentioned gage and connected at its lower end to the expansion tank and having 25 

